Season 4 Plot
Still reeling from the trauma of a previous case a year ago, the now-retired Harry Ambrose travels to Hanover Island in northern Maine for a recuperative getaway with his partner Sonya, but when an unexpected tragedy occurs involving Percy Muldoon, the daughter of a prominent island family, Ambrose is recruited to help the investigation, only to be thrown into a mystery of mounting paranoia that will turn this sleepy tourist island, and Ambrose’s life, upside down.
The Sinner Season 4 aired on October 13th, 2021.
Season 4 Episodes
1. Part I
Ambrose visits the town of Clark Harbor for a getaway and finds himself at the center of a tragedy.
2. Part II
A new suspect leads the investigation into an ongoing feud between the Lams and the Muldoons.
3. Part III
Ambrose heads to the mainland to learn more about Percy's past and uncovers dark family secrets.
4. Part IV
When the Muldoons push to close the investigation, Ambrose refuses, pushing Sonya to the brink.
5. Part V
Ambrose discovers the source of Percy's ritualistic practices and dives deeper into her past.
6. Part VI
A shocking new crime further rattles the town of Clark Harbor; Ambrose and Meg team together.
7. Part VII
Unsure whom to trust, Ambrose hunts down his pursuers.
8. Part VIII
Ambrose exposes the secret that threw Percy's life off course, setting off widespread consequences.
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